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Sequoia 1455 McDowell Blvd,North Ste49 D <br /> 41) Petalunla,(707 79 -1954 <br /> (707)792-1965 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P403320 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntnm-50265 Reported <br /> Sacramento CA,95833 Prnlect Manager Vernon P Elarth 04/05/04 11 06 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPA Limit Notes <br /> Batch 4C25003-EPA 5030B PIT <br /> Blank(4C25003-BLK1) Prepared&Analyzed 03/25/04 <br /> Ethanol ND 100 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 <br /> Ethyl ten-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-Dichloroethane-d4 447 500 894 78-129 <br /> Laboratory Control Sample(4C25003-BSI) Prepared&Analyzed 03/25/04 <br /> Methyl tert-butyl ether 11 0 050 ug/1 100 110 63-137 <br /> ogate 1,2-Dichloroethane-d4 428 Soo 856 78-129 <br /> aboratory Control Sample Dup(4C25003-BSDI) Prepared&Analyzed 03/25/04 <br /> Methyl tert-butyl ether 102 050 ug/l 100 102 63-137 755 20 <br /> Surrogate 12-Dichloroethane-d4 452 500 904 78-129 <br /> Matrix Spike(4C25003-MSI) Source P403320-01 Prepared 03/25/04 Analyzed 03/26/04 <br /> Methyl tert-butyl ether 104 050 ug/l 8 00 017 128 63-137 <br /> Surrogate 1 2-Dichloroethane-d4 476 Soo 952 78-129 <br /> Matrix Spike Dup(4C25003-MSDI) Source P403320-01 Prepared 03/25/04 Analyzed 03/26/04 <br /> Methyl tert-butyl ether 105 050 ug/l Soo 017 129 63-137 0 957 20 <br /> Surrogate 1 1-Dichloroethane-d4 467 500 934 78-129 <br /> �duoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical reporl must be reproduced in its entirety <br /> Page 13 of 16 <br />